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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67dfbd948c72cd0a8cefe50c586275e7846f6aee7c98af97b7eeeb8caa30a87b' 
  AND token = 'gYqas1dy7rqflluwk3jbVQzITmjMWMIn4PMKiLEPqaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}